Rotary gas-engine



J. W. GREEN.

ROTARY GAS ENGINE. APPLICATION Huso DEc. 22. 1916.

latenfed June 3, 1919.

3 SHEETS-SHR( I.

J. W. GREEN.

ROTARY GAS vENGINE. APPLICATION FILED DEC. 22. |916.

l ,$05,966. Patented June 3, 1919.

3 SHEETS-SHEET 2.

w n Q iIIIIIIIIIIIIIIII IIIIIIIIIIIIIINIIUNM 5% N 0 "z v v1. w. GREEN.ROTARY GAS E NmNE.

APPLICATION FILED DEOZZ. IQIG. l 1,305,96. .IRIRnfedJune 3, 1919.

3 SHEETS-SHEET 3.

a z 'gi 2l. Nukem y/CornfzLIr-nke '/Exp. Comp. Comf. Explo. EXP. Exh.

JAMES WILLIAM GREEN, OF PORTLAND, OREGON.

ROTARY GAS-ENGINE.

Specification of Letters Patent.

Patented J une 3, 1919.

Appiication ined December 22, 191e. serial No. 138,397.

To all whom t may concern Be it known that I, JAMES WILLIAM GREEN, acitizen ofethe United States, residing in the city of Portland, countyof Multnomah, and State of Oregon, have invented certain new and usefulImprovements in Rotary Gas-Engines, of which the following is aspecific-ation.

My invention relates to rotary gas engines, and it has among its salient,objects to provide an internal combustion engine in which are aplurality of revolving rotors, or vanos adapted to be intermittently andalternately driven forwardly, and' also to be intermittently andalternately locked against backward movement, whereby to form anabutment between which, and the rotor, or vane, next to be moved, theexplosion takes place and drives the movable rotor. or vane, forwardlya. partial rotation. Said latter vane, or rotor, is then locked againstbackward movement and it becomes the abutment between which, and saidfirst rotor, or vane, another explosion takesY place and drives saidfirstA rotor forwardly a partial turn. Another object of my invention isto provide in a. device of the character referred to a construction inwhich the intake of the explosion mixture, the compression, theignition, or spark, and the exhaust are automatically controlled by therevolutions of the rotors, or vanes, and can take place at any pointaround the arc of a circle.

In order that others may understand my invention I have illustrated onepractical form thereof in the accompanying sheet of drawings in which,-

' Fi 1re 1 is a longitudinal vertical sec- 'tiona 'viewthrough myinvention;

Fig. 2 is aivertical cross sectional view taken on `line 2-'r2 of Fig.1; Fig. y3 is a' vertical cross taken on line 3'-*3-.of Fig.v 1;

Fig. 4 is a veitical, crosssectional view taken on line 4-4 of Fig. 1;Fig. 5 is a vertical, cross taken on line 5--5 of Fig.: 1;

sectional View Fig. 6 is a top plan view of the emloodi-v ment of myinvention, as here shown for purposes of illustration;

Fig. 7 is a vertical cross sectional view taken through the rotorcasing, on line -7'-7 of Fig. 1;

Fig.` 8 is a side elevation of one ofthe rotors, or vanes, of myinvention;

thereof sectional view Fig. 10 is a side elevation of an aperturedbearing sleeve, which ts over the righthand end portion of the rotorshown in Fig. 8;

Fig. 11 is a vertical cross .sectional view taken on line 11-11 of Fig.10;

Fig. 12 is a side elevation partly in section of the exhaust valvemechanism;

Fig. 13 is a fragmentary top plan view thereof;

Fig. 14 is a face View of the base thereof, with the mechanism removedtherefrom;

Fig. 15 is a side elevation of another rotor,

or vane, with the upper portion shown in section; v

Fig. 16 i-s an end view of said rotor.

Fig. 17l is an end view taken on lines 17'- 17 of Fig. 1, showing twotraveling contact members which control the sparks; and

Fig. 18 is a similar view taken on line 18-18 of Fig. 1, showing twocoperating contact devices.

Figs. 19, 20, 21 and 22 are diagrammatic illustrations, showing in ageneral way, a cycle of operation; that is,-

Fig. 19 shows the relative positions in the` rotor cylinder of theintake, the compression, the explosion and the exhaust. while Figs. 20,9.1 and 22 show the .same successively changed relative positions ofthese functions.

In my invention, as here illustrated, I have shown two rotors, or vanes,arranged crosswise of each other, X-fashion, and turning about a commonaxis, said rotors. or vanes, being notched at their central portions,however, so as to interit 'with each other, whereby their vane portionscome together latwise at diametrically opposite sides of their centers.I have also made provision for automatically locking each of saidrotors, or vanes,I against backward movement, and in the presentembodiment of the invention this means for so locking said rotors, orvanes,'is accomplished through the hub, or sleeve, portions. I have alsoprovided the intake and exhaust ports through the hub, or middle portionof one of said rotors, and to this end the hub, or bodyportion' thereof,is chambered, as hereinafter and exhaust ports, with proper connectionsfor taking in the explosive mixture at any point of rotation of saidrotors, through any one of said ports, and afterward exhausting theburnt gases therefrom through the same ico described, to provide thenecessary intake il 'all operating the same. :v 'an-intake port, isclosed Each port serves as during compress1on '4 '-and explosion and isthen opened as-an eX- .their opposite ends,

' which projects over the hub, or body,

v'fhausl port,.a`nd then asan intake`port.

1 will -now describe in detail the embodiment of my invention. as hereillustrated on the accompanying three. sheets of drawings.

Referring to Figs. l, 6 and 7, 1 designates a drum-like casing fhavingformed on one side an annular flange 2. Rotatably mounted within saidcasing 1, are two rotors, 3 and 4, Figs. 8 and 16, having, respectively,the vane portions 3a and 3b, and 4 and 4b. Referring more particularly4to Figs. l, 7 8 and l), the rotor 3, is shown in side elevation in Fig.8, and in end elevation in Fig. 9, and is provided with the hub-likeextension 3", provided with five pairs of expansion rings, as 3d-3d.Said hub-like extension is chambered longitudinally at its fourquarters, circumferentially, as at 5, A6, 7 and 8,

.which chambers open out at their right-hand ends, respectively, betweenthe pairs of expansion rings, as at 5a, 6a, 7a and 8, and atsaidchambers open out adjacent the vane portions 3al and 3b, as at 7b and8", as clearly shown inP Figs. 7 and 8, and also in Fig. 1.

Said rotor 3"also has a reduced, hub-like extension 3e, extending out tothe left-side .of the vanes'3a and 3*', as clearly shown in Figs. l and8. The rotor 4 is mounted upon this extension 3e of the rotor 3, and hasan intel-fitting connection with the rotor 4, whereby the vanes 3a and'3* of the rotor 3, and vanes 4 and 4b of the rotor 4 are ln'ought intooverlapping relationship with each other, or so as to occupy the samepath of rotation, that is, the vane portions 3 and 3* of the rotor 3,have an extended width porporof the rotor 4, r'have a breadth extensionwhich projects over the body, or middle portion of the rotor 3, as willbe understood by reference to Figs. 8 and 15. A shaft 10, is extendedthrough the hub, or central portions olf the rotors 3 and 4, as `clearlyshown in Figs. 1 and 7,

tion of the rotor 4, and the vane tions 4a and lb said shaft beingprovided at one end with driving device 15, is

,I end of the'sleeve, or l 'Gai-,of the i'otoi"'3,"1s an` irregulareccentrlc drivan arm 11,"keyed thereto, as at 12, and provided withforks v13--13, at its opposite ends adapted to. receive the screw bolts14.--'l4, which are screwed into the body of an eccentric locking device15, shown in longitudinal section in Fig. '1, and in cross section inFig. 4, said driving device 15, turning on the'v extension 3", and beingscoured by means of set screwslG-l, to the hub, or body portionof therotor 4, whereby said eccentric secured to and, turns Mounted on theouter hub-like, extension 3,

with Isaid rotor 4;

ing device 17, shown in section in Fig. 1, and in end elevation in Fig.3, said device 17 having neck-like portions 1717a, which support theeccentric cam devices 17h-p17, as clearly seen in Fig. 3, it beingunderstood that the screw bolts 14E-14, extend along adjacent the neckportions 17a-17, of said driving device 17, whereby the latter can' onlyturn a partial revolution at a time in the direction of the dotted-linearrow, Fig. 3, after the arm 11, together with the screwbolts111-14 and the member 15, have been turned a partial revolution.` ing orholding rollers 18418, is mounted between the eccentric cam faces15a*15a, of the member 15, and the flange 2, on the side of the rotorcasing l, as will be seen in Fig. 1. A main driving shaft 19, isprovided with a drum, or bell, tially the same diameter as is theannular vflange 2, on the side of the rotor casing l, and is placed overclose the end of the shaft l10, the arm 11, and t-hevdevices 15 and 1.7,and forms, as it were, an extension of. said annular flange 2, as willbe clearly undcrstoodfrfom Figs. l and 6. Also vmounted between theeccentric cam faces 15- 15a ofthe member 15, is a pair of drivingrollers-- 214-21, normally pressed outwardly by means of springpressedplungers 299-22, .as clearly shown in Fig. 4, whereby d l driven in onedirection it. will be locked to and drive said bell or drum 20, but willbe free to turn in the opposite direction without turning said drum orbell 2O on the shaft 19. Mounted between the eccentric cam faces17"-17b, of the member 17. and the inside of said bell, or drum, 20, isa pair of driving rollers 23-23, also normally held in locking positionby means of spring-pressed plungers 23-23, as will be clearly seen fromFig. 3. Thus by means of the rollers 23*Q3, the driving device 17,secured to the extension 3e, of the rotor 3, makes it possible to lockthe bell or drum 20, of the main driving shaft 19 to said rotor 3 forinter- A pair of lock- I portion 20, of substan' and around, so as toinwhen said device 15,.is

mittently driving said bell 20 and its shaft 19 in one direction, whilethe rollers 21-21, between said bell or drum 20, and the driving member15, secured to the hub of the .rotor Ll, makes it possible to lock saidrotor n'iovemenr. or rotation by means of a pair of i rollers 24e-24,operating onl the opposite' end of its hub or extension 3., To this endlthere is keyed., asat 27, to tirer ani-eccentric locking' simi lar holding end' of said .extensioii device 25, similar to lthe device 15, shownin Fig. 4, and having similar eccentric cam faces between which and anannular ring, or collar 26, secured to the casing, hereinafter referredto, said rollers 24-24, operating to lock said rotor 3, against anybackward movement.

Mounted at the side of the rotor casing 1, around the extension 30,' ofthe rotor 3, is a cylindrical casing 30, shown in section, Fig. 2, andadapted to be secured to the side ot the rotor casing l, as by means ofbolts 31-31, said cylinder casing 30, having t'ornied therein a. seriesof annular spaced cha1nbers,ias 32, 33, 34 and 35. Mounted within saidcylindrical chamber is a cylindrical skeleton, or apertured bearingsleeve 3G, shown in side and sectional views in Figs. l() and 11, theapertures in said bearing sleeve extending circumferentially therein andbeing spaced apart so as to register with the annular chambers 32, 33,34 and in said cylindrical casing 30, as will be clear from Fig. 1. Saida'pertured sleeve, as will. be noticed, tits .closely around theextension 3c of the rotor 3, and the expansion rings 3d thereon, theapertures in said bearing sleeve registering with the spaces between thepairs of extension rings.

Thus it will be understood that the different chambers 5, (l,

*i vot' the -rotor 3, open at their ends 5% 6a, 7a

lindrical casing 30.

through the apertures and into the annular chambers 35.- 34, 33 and 32,in .the cy- In Fig. 2, the chamber in said extension 3c, is shown.- withits opening 5 opening through v.t he.apertured ring '3(3, into theannularchainbe `35.. cylindrical casing 30, is provided'atone and' Sa,respectively,

-side with a flat flange-like face 30a, to which is adapted to beattached the'v exhaust valve Figs. 12, 13 and 1 4,

mechanism, shown in and hereinafter again referred to.- The annularchambers 32, 33, 34 and 35, in said cylindrical casing, have outletports through said fla-nge or face 30a, Fig. 2, which-,outlet ports are'designated 3,2, 33t, 34a and 35,

the outlet port 35a, being shownin f ull lines injsaid- Fig. 2, lwhilethe other outlet ports areindicated invdotted lines. Secured flativiseto said aiige,'o`r face,-30. is the exf haust l.valve mechanism, shownin Figsf'12 1 .35?, through "Said lllange said base plat mnected.v

fore, designa v65,

and 13, .saidexhaust valve vmechanism being shown in place in 4topand'coniprisiug a base plate 40, having the bolt. holes 40E-40", screwbolts 40"-.-10 Fig. 1 2. plate also has four exhaustapeijtures' there?through, which correspond and register with' the exhaust apertures322332145 nd tace 30", to.

the-v exhaust 'apertures through vsaid 7 and 8, in the extension 3"(plan view in Fig. 6,

therein, to receive the.

Said base `I have,"there A h'- Athe same reference' and 44 control,respectivelygjthe,exhaust out-V v l lets through the exhaust `apertures35a, 32a and 33a, intol a common exhaust chamber, 45,l from.which`i.;.is :an'joutlet opening formed by the'v extension; 46,. asshown in FigsrlQ and 13. Said valves'41, 42, 43 and V44, are 4 mountedonpiston rods 41, 42a, 4.31

and 4'4a (not, shown) connected with pistons 41h, 42b (not shown), 43and 44h, working in small cylinders 41', 42" (not shown), 433 and 44C.Said piston iods41a, 42a, 43a and 44a, extend in a reduced size throughsaid valves 41, 42, 43 and 44, and Vout through packing nuts 47., 48, 49and 50, and are normally pressed inwardly, whereby lto seat Said valves,by springs 51, 52, 53 `and 54, on thenuts 40".

Thus it will be understood, for example, that any explosion through oneofthe ex-f haust ports 32a, 33a, 34a or 35a, above the valve adjacentthereto, will-force the piston,` which is adjacent thereto,

and whose Cyp the next valve in o' der, against the tensioir ot itsspring, `thus allowing the burnt gases from the .previous explosion tobe exhausted throughsaid exhaust port into said genera-l chamber 45,landout through the outlet '46. Toshe morespeeifidany explosion throughthe exhaustV port 35a, above valve 41, Fig. 12, will force piston'43?,so as to open valve '43, against the tension ot its spring 53, and allowburnt gases tobe exhausted'through exhaust 'opening-j 32, and:intof-the'general chamber 45.] l A' Referring now to Figs. 2 and3 thereis mounted upon the top of the fcylindricalv casing 30, by means ot thebolts 60-G'0, a box-like member `G1, forming an inlet chamber62, intowhich is provided a general inlet indicated'at G3. Spring-closed valveand valve stems, designated in a general way 64, 65, 66 and 67, controlthe communication trom the inlet chamber 62, to the respective annularchambers 35, 3 4, 33 Aand 32,v of the cylindrical casing 30. The generalconstruction and arrangement of these respective valves64, 65, 66 and 67is clearly shown in the sectional view, Fig. 1, and need not bedescribed more in detail. It will thus vbe understood `hat Va supply ofexplosive mixture connected tothe general inletl 63,'. passes into thegeneral chamber 62, inthe iiol ' casin box 61, and as suction is appliedthrough any of the passage chambersv 5, 6, 7 and 8, extending throughthe rotor extension 3, respectively, to the annular 4chambers 35, 34,33, and 32, that said valves 64, 65, 66 and 67 will yield.

Also mounted in the top of the cylindrical 30, and abovethe respectiveannular cham' ers 35, 3ft, 33 and 32, are spark plugs 70, 71, 72 and 73,shown in top plan View ir Fig. 6, in which-figure also it is shown thatsaid' spark plugs 'are' electrically connected in pairs, spark plugs 70vand 72 being conn eted Atogether to wire 74,v so as to spark atSametime, and spark plugs 'l'v'andv 73 being electricallyconnectedtogether by the wire 75, to spark at the same time, 'saidWreS'7fta`I'1d`75 leading to andv connecting, respectively, with contactrings 76.and 77. The'contact rings 7.6 and 77 aresupported at a space'lapart upon sleeves 78 and 79, of in'.- sula-ting material upon bolts 80and 81, which are secured to a ring 82, attached to the member 25, keyedto ,the end of the hub extension 3c', of the rotor 3, whereby saidcontact rings 76 and 77, revolve withy said rotor.- Two contact members,or prongs, 83 and 84, are carried by said contact rings 76 and 77contact member 83 being connected to Contact ring 7 6, and beinginsulated "from ring 77 although passing .through the same," whilecontact member 84 is attached directly' tofcontact ring 77. Secured tothe shaftflU, "posite the contact rings 76 and-77, isa klike member 85',tothe faeeoflwhichis. ted at a *spacev therefrom, fa ,contactring .tafctlmembers 8.8 and 89,

material holds said Contact ring'f 86,zin`su latedf'from the di'sk85.Secured to the face ofsaid contact ring 86, are two spring con shownalso in'face view of'. Fig.v 18,- said` contact members 88 4 and,89,'.being--adapted to intermittently 4con'- and*itliely 'contact ring lend, is'connectedthrough the parts 11,14,

' 1-5 and 16, t'o the hub of the vInen'lbersv 88 and 89 revolvev with lrotor .4,

rotor llarcontact l overliev the hub portions of 'gages from the d g l icimuxnferentiallythereoh between which gear ring, or rim, 95, havingformed on its inner face a series of eccentrically disposed runways,similar to the run-ways 93, shown' in Fig. 5. Between said gear ring 95,and the'mem'bers A'25 and 26, are two series of balls 96, and 96, asclearly shown in Fig. 1, the larger ones 96, being locking balls andoperate in exactly the same manner as do. the llocking balls9-1, shownin Fig. 5. VThe series of balls 96l forma bearing between the vparts 26and 95.

Mounted in a suitable bearing block 97, is a short shaft 98, to theouter end of which, as at 99, maybe attached any means for applyi'ng`power. Mounted on said shaft near its o posit'e ends are two gears 100and 101, whic meshrespective1y, with the gears 91 and95. Said gears` 100and 101 are formed with hollow inner adjacent faces, and are providedtherein, .keyed to saidshaft 98, asv at 102f-102 with disk-like members'10S-:193.13m .with afplurality-`4 of s' pacing sleeveslOatlOa,`hichare', attached rings 4105+105. An E ed aroundA their outer edges 4ed: tobe engaged by ta pawl, or dog, as 107, 'one of whichis'fypivotallythe disks 103-L-f1'03', as .between the disk 103 1 and its ring 105. j'Thefinner ends of'said ,107, ride uponthe vI'nojecting pawls, or dogs,

secured to each of opposite vend portions of the bearingblock'V 97,which opposite ends are formed ,into l,flang'elike extensions, as97-'97, which the disks ID3- 103, as clearly' shown inFig. 1. Saidflange-like extensions 975-97?, of said bear- 'ing block 97, are cutaway,]asat 97h, for a portion of the circumference thereowhere- Aby whenthe inner yend off-thep'awh or disk, 107, reaches. this "cl'i't`-.avv{a-y portionl 97,.- i-t is free to swing and' automaticall jgdisenfriving; tooth, or ug, 106,

r-orr thevi'nner face. vof the gear 100. These 'cut-out'ljportions1197", at theopposite ends ofthebearing blocki97, areatidi'erentposil. tions .eiroumfe'rentiall gtaiting kshaft 98,1'iszturned, (n'e of the' gears,

so that when the shaft A through i Byfthe-t eine pa 60er-107, cutawayportion-97h,-

free the driving tooth, or lug, 106, on the gearv"100, and bythis timethe correspond- In Fig. 21, it is Fig. 22, it is a still furtherstepback Insubstaningv pawl,"or dog,107, on thev diskV 103, in

. gear 101, engages a corresponding driving tooth, or lug', 106, in saidgear 101, whereby the continual movement of shaft 98, in the samedirection drives gear 101 a partial i rotation, vand through itsconnections with gear ring,- or rim, 95, and the part 25, drives therotor 3 a partial rotation. tinual turning of the starting shaft 98,alternately drives` gear 91 and gear ring 95, eachl a -partial rotation,and through their connections alternately turns the rotors 3 and 4partial rotations.

The operation of my invention may be briey described as follows:

Referringto Figs. 19, 20, 21 and 22, I have. illustrated in a' generaldiagrammatic manner one cycle of the operations; that is, in onequarter, or section, of the rotor casing, as the rotor vanes arealternately and intermittently moved, the explosive mixture is beingtaken in; in the first' preceding quarter, a charge of explosive mixtureis being compressed; in the second preceding quarter the explosion ofanother charge is taking place, and in the last preceding quarnoticedthat this order of functionsv steps backwardly substantially onequarter' each,

time; that is, the intake isone step back, in Fig.v20, of its position`as shown inF ig. 1 9.

a further step back, and inA the next action it would be again tially inthe position of the intake, Fig, 19.

It will be understood, of course, that figures do not always representthe'exact.. o'-

sitions at which the Junctions'the inta e,

description of the compression, `the explosion and the exhaust takeplace each time, for the rotors are revolving and therecan be and is ageneral shifting, it being understood that' the intake may take place atany point aroundA the arc of the circle, as may alsor'the compression,the explosion and the exhaust@ Referring now t0 Fig. l' ,we-will-"assume that a charge of gasA has" just been compressed between rotorvanes''. and 4, and that an explosion isV taking place Rotor vane 3, islocked against` backward movement while rotor wardly, ahead of itthrough the chamber outlet v5. The rotor vane 4", will compress avcharge of gas ahead of it as Yit approaches rotor vane 3?, and movesinto the position shown in dotted lines, and atthe same time it willdraw in a' charge throughl chamber-7, in its rear. As the rotorvanexf4". approaches the rotor vane 3'* above, ashown in dotted-lines,compressing the char therebetween, aniother explosion takes p aceywhich:drives the rotor 3 forwardly, its vane, havingl re#l Thuscondrawings, that van-e 4, will be driven forand `will exhaust the burntgases ceived the impulse from the explosion, is driven forwardly. andforces out the burnt gases ahead of it, while its rotor va ne 3? iscompressing a charge in front of it, and is drawing in a fresh charge inits rear. Thus the operation is repeated continuously, the position ofthe explosion being one step back each time, as is illustrated in thediagrammatic Figs. 19 to 22.

It will 'be understood, of course, from the detailed description, thatthe contact members of the'sparking mechanism travel with the rotors,and that they can be so adjusted that as the rotor vanes approach eachother, the spark takes place therebetween, nomatter at what position inthe rotor casing they may be, It will also be understood that thepassageways from the general supply chamber 60, through the annularchambers 32, 33,' 34 and 35, and through the .dierent chambers 5, 6, 7 vand 8, inl the rotor extensionc, to the rotor casing, are automaticallyclosed by the valves64, 65, 66 and 67, excepting when there is an intake`suction applied through any one of these passageways to the generalsupply chamber 62, sufficient to open its particular valve.v 'It willalso be understood that these passageways are also automatically andsuccessively opened through the exhaust valve mechanism, it having beenshown how the force of an explosion in one of the chambers, as through35a, Fig; 12, moves piston 43" and opens valve 43 for exliaustfthrough32a into45, and out through 46,-'5thi'1seach explosion opens the exhaustvalve to a preceding chamber in which an explosion has. taken place,whereby ,the burnt gasesffare forced out of the diierent chambersI insuccessive order.

-Thus'l-it will be seen from the foregoing one practical embodiment oftaken in Aconnection with vthe I have produced an improved rotaryinternal'combustion engine, in which the power is applied direct to thedriving shaft', without theuse of cranks. I have also roduced in such anengine a constructionin which the intake of the explosive mixture cantake' place at any point around the are of .the circle, andI also aconstruction in which .the exhaust can be made at any point around thearc of the circle.l

Attention is also called to ;-the fact that in-v asmu'oh as spark4 plugs'7 Gand-,72 are, connected to operate together, asare also spark 1 plugs71 and f? 3, two sparks take place at the same time between the oppositeends of the rotor vanes,so that ifthereis any explosive mixture leftbetweenany two of the vanes asA they approach eachother,y it willfbeyexploded at the-same time-the' main charge is-exploded between thetwoopposite' rotorvanes.r For example, referring' to Fig. 7, assumingthat a spark is yduefbetween rotor vanes which will drive v rotor vane 4my invention,

las

3? and forwardlyfio the sides of said casing,

- shaft therethrough, pistons in crossed-rremiv ' pistons havinglongitudinali y' into the dotted line position, there will also lbe aspark for discharging any explosive mixture which mayhave remainedbetween rotor vanes 3b and 4b, which explosion, 1f

any, would coperate with the main explosion taking place betweenl rotorvanes 3a and fla. The main explosion would drive the rotor vane 4aforwardly, while the'other'explosion, if any, would drive itsfoppositeend,-

rotor vane 4th, forwardly..

Attention gis also calledto theflact that the the screws, or bolts,-60."

y I am aware that many changes. lcan he4 made in my invention as'hereshowinVv and described for purposes of illustration,"with outdeparting from the-spirit thereof, andv I,

do not, therefore, limitJ the invention to the embodiment here shown,fexceptasjfgmay be the hereto appendedclaims.

limited by I claim:

1. In a rotary engine, a-pistoi'i .easing,pis tons arranged in crossedrelationship therein and adapted to move forwardlystep by stepalternately', means for. vholding said pistons against backward movemenhpistons'having hub portions extending from onev of'said hub portionshaving combinationv inletl and exl .haust passageways extendinglongitudinally position outside of said casing, -andgcontrot- .lingmechanism outside of saidgjeasing forcontrolling the inlet andexhaust"actioii-pfportions formed to have therethrough from withinthe-.casing to a said engine, substantially as described.; v

I2. In aI rotary engine, a -pistoncasing, a

lationship in said axis of said shaft, portions ininteritting'relationship' around said shaft, the hub portionl ofl casingvto vturn "about "the passageways therethrough 1 to; ltliespaces be'-tween said pistons, means .for automatically holding said pistonsagainst v :backward movement, said means beingoutsideof said casing,valve mechanism controllingythe passageways through the hub portionreferred to, and ignition mechanism including rotating Contact members,substantially as described. Y y

3. In a rotary gas enUine,-,in combination, a piston casing, a shafttherethrough,two pairs of pistons mounted thereonin'crossed relationshipwith each other, said pistons having hub portions in interiittingrelationship around said shaft whereby said; pistons follow each otherstep by step, phehub portion of one pair of pistons proJectingrom oneside of said casing and the hub portion of the other pair of pistonsprojecting from frias' is fuseau@ of .the

said

the opposite side of said casing, one of said hub portions havingtherethrough, longitudinally thereof, a plurality of passagewaysterminating at their inner-ends in said casing-between the pistons,andvalve controlling'niechanism forthe outer ends of said passagewaysoutside of said casing.

4. In arotary gas engine, 1n combination, a piston casing, a shafttherethrough, two

lpairs of pistons mounted thereon in crossed relationship with eachother, one of said pistons havinga hub portion extending through-.thesideof said casingand having longitudinally extending ports therethroughterminating at their inner ends within the casing, 'between theApistons, and at their outer ends outside of said casing, valvevmechanism around said hub portion outside of 'said casing forcontrolling inlet and exhaust action through said passageways, and

'ignition'.means therefor, substantially as described. y

5... 'In ajrotary internal combustion engine, a casing,t wo pairs ofpistons therein in `crossed'relationship, said pistons having hubportions, oiiejof which extends through the side of the casing ,and isprovided with `a plurality ofzseparate, longitudinally extendingpassageways terminating at their inner ends withinsaid casing, betweenthe pistonsyand at their outer ends outside of said casing, and valvemechanism for controlling said passageways as inlet and exhaustpassageways, as said pistons are revolved, substantially as described.

6. In a rotary internal combustion engine, a casing, two pairs ofpistons in crossed relationship therein, sai pistons having huboverlapping interfitting. relationship with each other, whereby pistonsfollow each other, step by step,

e* trolling said passageways as inlet and exhaust passageways.

In a rotary internal combustion engine, a casing having a shafttherethrough, twopairs of pistons in crossed relationship within saidcasing said pistons having hub portions formed to have overlapping -andinterfitting relationship with each other, whereby said pistons followeach other step by step, means for holding said pistons automaticallyagainst any backward movement, the hub portion of one pair of saidpistons having a plurality of separate passageways longitudinallytherethrough from outside of said casing to a point within said casingIbetween said pistons, valve mechanisms-around the extended hub portionfor controlling'said passageways outside of said casing, for inlet andexhaust functions, and

oiieof'the hub portions having a plurality of separate passagewaysextending longitudi- -fnall'y therethrough from outside of said fsaidfuvding means including revolving Contact ignition for said engine,substantially as members described.

8. A rotary gas engine of the character referred to comprising inlindrical casing, a pair of rotors mounted therein to turn about acommon axis concentric with said casing, one of said rotors having alhub-like extension provided with a plurality of chambers therethroughand opening into said casing, and the other of said rotors beingrotatably mounted in intei-fitting relationship at its hub-portion withsaid first rotor, whereby the rotor vanes are in crossed relationshipwithin said casing, a driving member having operating connections withsaid rotors, means operating to prevent any backward rotative movementof said rotors, means for connecting a supply of explosive mixturethrough the chambers of said rotor hub extension, with valves forcontrolling the same, an exhaust valve mechanism connected with saidchambers through said hub extension, whereby said chambers act both asexhaust passageways and intake p'assageways to said rotor casing, and asparking mechanism controlled by said rotors for igniting the explosivemixture, substantially as described.

S). A rotary gas engine comprising in combination a cylindrical casing,a pair of crossed rotors rotatably mounted therein to turn about acommon axis, means for locking said rotors against backward rotativeCopies of combination a cythis patent may be obtained for iive centseach, by addressing the movement, means providingA inlet passagewaysinto said casing through the hub portions of said rotors, means forconnecting a supply of explosive mixture to said passageways, wherebythe Same is drawn into said casing by the -rotative movement of saidrotors, valve mechanism for controlling the supply of said explosivemixture to said passageways, means for igniting said explosive mixture,said means being controlled by said rotors, and an exhaust valvemechanism connected with said casing, substantially as described.

10. A rotary gas engine comprising in combination a. easing, a pair ofrotors therein to turn about a common axis, one of said rotorsv having ahub portionextending through the side of said casing with a plurality ofseparate, longitudinally extending passageways therethrough from a pointoutside oi said casing to a point inside of said casing, the other ofsaid rotors being rotatable in interfitted relationship at its hubportion With the first rotor, whereby said rotors are in crossedrelationship in the casing, and means outside the casing forautomatically locking said rotors against backward movement,

Signed at Portland, Multnomah county, Oregon, this 15th day of December,1916.

JAMES WILLIAM GREEN.

In presence 0f- I. M.V GRIFFIN, J. C. STRENG.

Commissioner of Patents,

Washington, D. C.

